i went to the dentist due to
tooth pain and throbbing, he said the
tooth was
infected and needed a root canal, he put me on penicillin for two weeks, then had root canal, still on penicillin, a couple of days later the pain was real bad. i called him at home and told him the penicillin wasn't working, so he called in keflex 500mg. took it for 5 days, seemed to get a little better, now 6 days and i'm in a lot of pain all over again.the infection started all over again.